Launching today
WhoisJSON
WhoisJSON — WHOIS, DNS & SSL in one API key. Free plan.
1 follower
WhoisJSON — WHOIS, DNS & SSL in one API key. Free plan.
1 follower
One API key for WHOIS lookups, DNS records, SSL validation, and domain availability. JSON or XML. 1,500+ TLDs, RDAP-ready. Start free: 1,000 requests/month, no credit card required.
Hey PH! 👋 I'm Florian, solo founder behind WhoisJSON.
I built this because I needed a simple, affordable WHOIS API for my own projects and couldn't justify paying $100/month for WhoisXML when I just needed clean JSON responses.
WhoisJSON gives you WHOIS, DNS, SSL, subdomain discovery and domain monitoring under a single API key — free plan included, no credit card required.
It's been running in production since 2016, serving developers and security teams worldwide.
Happy to answer any questions about the stack (Node.js, MongoDB, PM2 cluster), the WHOIS/RDAP protocol, or how we handle 1500+ TLDs. AMA! 🚀